What does "jesuit" mean?

Jesuit: Fig.: A crafty person; an intriguer. Jesuits' bark, Peruvian bark, or the bark of certain species of Cinchona; -- so called because its medicinal properties were first made known in Europe by Jesuit missionaries to South America. -- Jesuits' drops. See Friar's balsam, under Friar. -- Jesuits' nut, the European water chestnut. -- Jesuits' powder, powdered cinchona bark. -- Jesuits' tea, a Chilian leguminous shrub, used as a tea and medicinally.